Drill-rod extractor.



W. SCHiLDW/CHTER.

DRILL ROD EXTRACTOR.

APPucATxoN man M^R.2e, 1914.k

Paz-@med Dec. 'il i915.

' drill rod has become broken beneath the sur-- UNITED sTA'rns DRILL-BOD EXTRACTOR.

Application filed March 2G, 1914. Serial No. 827,411.

To all whom z't may concern Be it known that I, WlLLIAM SCHILD- wAcn'rEn, a citizen of the United States, residing at IValworth, in the county of Custer, State of Nebraska, have invented certain new and useful Improvements in Drill-Rod Extractors; and I do hereby `declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to drill and pump rod extractors, and is to be used where the face of the ground, and a broken section has been internally threaded, preferably by the use of the device shown in my application Ser. No. 862,040 filed Sept. 16, 1914.

An object of this invention is to provide for the ready removal of a drill rod which has been broken in the ground.

With these and other objects in view such as will appear as the description proceeds, my invention consists in the' combination and arrangement of parts as herein set forth and subsequently claimed.

Referring to the drawing: Figure 1 is a side elevation partly in section, showing my device in place 1n the drill rod. Fig. 2 is a section on the'line 2 2 of Fig. 1.

Referring to the drawing by reference characters wherein similar characters represent similar parts throughout the several views: 1 represents the casing in which is operated a drill rod 2 having a broken section 3.

My device comprises a cylindrical guide member 4 open at each end and having at its lower end removable collars 5 for position` ing the guide member 4c concentrically with respect to the broken section 3 of the drill rod. An inverted conical member 6 is secured to the guide member Ll by means of lthe'screws 7 extending through the apertures 8 in the guide member and into the apertures 9 in the collar 10 of the conical member 6. The portion of this member 6 below the collar 10 lis'screw threaded and has thereindiametrically opposite apertures 11 and a centrally located longitudinal aperture 12. In each of the apertures 11 is slidably mounted a gripper member 13 for gripping the ksides of the bore in the drill rod when the member 6 has been inserted therein. These members 13 are beveled on Specification of Letters Patent.

Patented Bee. Jg

their inner ends, as at 14,1and heir outer ends, ask at 15, and ,areprvidedfontheir outer ends with knife edges'f16'.: @The sliding movement of these member'sf1f3tis limited both inwardly and outwardly-by' the lugs 17 on the member `6 which eXfQvIld into the slots 18 of the members 13.; I .pro-v vide several of these members 13 atdifferent distances from the ends of the member 6. so that different sized pipes' may be gripped and thus extracted. Extending.y upwardly from the collar 10 is a'threaded shank 19to,` which is attached the operating member 2G which is actuated by anysuitable .mechanism'. Controlled by this operating inember 20 is a rod 21 having a beveled end @22' which is pushed downwardly throughkthe longitudinal hole 12 and kengages the bev eled faces 14: on the members 13 to actuate the same to grip the inside surface of the drill rod. y'

In operation lafter the ,bore in the rod; 2 has been threaded my device i's'lowered in the casing 1 until the guide member 41: eneircles the drill rod 2 and is axially positioned on the broken portion 3 thereof by the collars Simultaneously the threaded conical member 6 is screwed into engagement with the threads on the inside of the broken portion 3 of the drill rod, it being understood that the members l13 are at their innermost position during this operation. W' hen the said member 6 is tightly in engagement with the screw threads on. the portion 3, the rod 21 is pushed downwardly through the longitudinal hole 12 and thus forces the said members 13 outwardly and into engagement with the threads in the bore of the drill member 2. The knife edges 16 on the said members 13 are thus embedded in the threads and tightly secure the member 6 and the broken portion 3 of the-drill rod together so that the drill rod may be lifted from the hole by pulling or unscrewing. It is to be understood that when a small pipe is to be extracted the conical member 6 is inserted into the broken portion of the drill rod far enoughso that the lowermost members 13 may be actuated to grip the threads on the bore of the said 1. rod, thus leaving the upper members 13 free to move downwardly to such an extent that they will allow the cylindrical portion of the rod 21 to pass therebetween. After the member 6 has been securely fastened to the 1 drill rod 2, the said member and drill rod are extracted fromthe hole and carry vith them of course the casing 4 which is attached to the collar l0 of the member 6. If for any reason I desire to Withdraw the member 6 from the drill rod l may do so by withdrawing the rod 2l from thehole in the .member 6 which allows the members 13' to be disengaged from the screw threads on the .inside of the drill rod and the said member 6 may then be unscrewed and Withdrawn.

en itis necessary to Withdraw a drill rod which is inclosed by a large casing I provide the lower end of the guide With one or more collars detachably held on the guide by screws 22', it being understood that each `collar extends out farther than the one on -While the latter is in place vbeneath the ground, and i have further provided. means for clamping my device to the said broken portion of4 the drill. rod. l I do not Wish to be limited .to the par- 3o ticular construction of my device shown,

for it is obvious that numerous changes may be made Without departing from the spirit of my ,invention and within the scope of the claims.

hat is claimed is l. In a device of the class described, an inverted threaded-conical shank having a longitudinal hole therethrough and transverse holes intersecting said longitudinal hole and extending through the face of the conical member, gripping members mounted in said transverse holes, said gripping members being beveled on their inner ends and having knife edges formed on their outer ends, means in said longitudinal. aperturey for actuating the said gripping members, and means to limit their movement.

2.' A drill rod extractor comprising a guide,'relmovable positioning means on said guide, a` threaded downwardly eXtending conical shank mounted Within said guide, gripping members slidably mounted on said shank, means for operating said gripping members, and means to actuate the shank.

In testimony whereof, l affix my signa'- ture, in the presence of two witnesses.

WLLIAM SCHLDWCHTER. Witnesses: Y

C. W. FoWLnn, D. E. MORRIS. 

